Furnace-casing.



W. P. HANSEN. FURNACE CASING. APPLIOATION FILED MAR. 29, 1910,

Pate'nted Sept. 27, 1910.

' farrangement and combination of the various FFICE.

7 WILLIAM F. HANSEN, OF DES MOINES, IOWA.

FURNACE-CASING.

Specification of Letters Patent.

Patented Sept. 27, 1910.

Application filed March 29, 1910 Serial No. 552,260.

To all whom it may concern:

Be it known that I, WILLIAM F. I'IANSEN,

citizen of the United States, residing at Des Moines, in the county ofPolk and State easily applied to any ordinary furnace and also so arraned that it will serve as an air intakefor the furnace and will heat theair to. a certain; extent before being admitted into the. air chamberbetween the furnace. and casing and also so arranged that it willprevent radiation of heat from the furnace/ and utilize all the heatthat will ordinarily be radiated in supplying the hot air pipes of thefurnace.

A further object is to provide improved means for screening the air thatenters the furnace to prevent the, entrance of dust. My inventionconsists in the construction,

' parts of the device, whereby the objects contemplated are attained,ashereinafter more fully set forth, pointed out in my claims andillustrated. in the accompanying drawings, in which:

Figure 1 shows the furnace body portion with an improved casingembodying my invention applied thereto and shown in vertical section.Fig. 2 shows aborizontal, seetional viewon theline 2''2 ofFig. l uponan'enlarge'd scale, and Fig. 3 shows a side elevation of a art of afurnace casing embodyi'ng my invention to illustrate the screen and thecorrugations of the outer furnace wall.

Referring to'the accompanying drawings,-

: Ihave used the referencenumeral 10 to indil cate-a-furnace bodyportion v of ordinary construction. v i

The improved casing which constitutes my invention comprises an innerand-an outer sheet metal wall,.the .inner wall being indicated by thenumeral 11 and the outer one by the numeral 12. Each wall is providedwith angular corrugations extended vertically throughout its entirelength for the purpose of strengthening and reinforcing same. The twowalls are held spaced apart and are connected with each other by meansof asheet metal strip .at the bottomhaving I fabric that will serve toexclude dust.

its side edges inclined upwardly at 13 and an upwardly projecting rib itat its center., The two furnace walls are placed in said strip betweenthe edge portions 13 and the rib 14 so that said strip performs thedouble function of holdin the wallsfspa'ced apart and also of connectingthem with each other. I also preferably provide a metal T-bar 15 to restupon the floor with one side projecting up into the rib, 14: tostrengthen and reinforce-it and form a solid foundation for the furnacewall. At the top of the furnace walls is another strip similar to theone at the bottom upon which rests the sheet metal covering 16ofrordinary construction. The outer wall 12 is provided near itslowerportion with a series of draft openings 20 and the innerwallis'provided near its upper end with a seriesof draft openings 21 ar:ranged to discharge into the space between the furnace and the furnaceeasing so that the air admitted through said openings may be heated bythe furnace and may be passed to the-hot air pipes 22. j

To provide for preventing the entrance of dust through the openings 20 Iapply two Wooden strips 23 to the outer wall of the furnace above andbelow the openings 20 and between said strips is a dust screen 24 whichmay be made of any ordinary woven In order to protect the screen 24 Iprovide a wire netting 25 secured to the wooden strips 23.. The owerwooden strip preferably rests upon the floor so that dust willnot enterthe corrugations of the outer wall. In order to prevent dust fromentering the corrugations at the top of the upper strip 23, I provide aflexible strip off-material 26 havmg one edge corrugated to conform tothe outer wall. The projecting portions 27 of the strip 26 enter thegrooves of the outer wall and the parts between the projecting portions,indicated by the numeral 28, preferably extend upwardly along the ribsof the outer wall. By this arrangement it is obvious that a dust tightjoint may readily and easily be made between the strips 23 and the outerwall and that the wire netting will prevent mice from obtaining-accessto the screen-24.

In practical use, 'it is obvious that the sheet metal furnace walls maybe corrugated longitudinally in any ordinary way and then when'lthey areconnected with the sheet metal strips at the top andbottom they will befirmly connected and also held spaced apart at the proper distance.Obviously the wall as constructed is of inexpensive construction and isstrong and durable.

By havin the openings in the outer wall only at the fiottom and theinner wall openings at the top, I provide for preventing the radiationof heat from the furnace on account of the fact that there is aconstantly moving current of cold air passing upwardly between the wallswhich is heated during this upward movement, which heat is carried bythe current of air into the interior of the furnace to be passed outthrough the hot air pipes. Furthermore the arrangement of the screens isof extremely simple and inexpensive construction and can be easilyapplied after the furnace wall is placed in position.

I claim as my invention:

1. An improved furnace casing, comprising an inner and an outer wallboth being corrugated vertically from end to end, the outer wall beingprovided with air passages near its bottom and the inner wall beingprovided with air passages near its upper end, a sheet metal strip atthe top and bottom of the casing, each strip having its edges extendedto position for overlapping the ends of the walls and also having acentral rib extending between the walls to thereby hold the walls spacedapart and to connect them with each other, a metal T- bar having its ribprojecting upwardly into the rib in the lower spaclng strip, a sheetmetal covering, and a screen device to prevent dust from entering theair passages in the outer wall. I r

2. An improved furnace casing, comprising an inner and an outercorrugated 'm'etal wall, the outer wall being provided with air passagesnear its bottom and the inner wall being provided with air passages nearits wooden strips, a wire netting connected with the outer edges of saidwooden strips, and a dust proof strip on top of the upper wooden stripextending around the furnace wall and designed to fit into thecorrugations thereof, the parts of said dust proof strip that extend'into the grooves of the outer wall being shaped to fit tightly intosaid groovesand the parts of said strip that engage the ribs of theouter wall being inclined upwardly, substantially as and for thepurposes stated.

Des Moines, Iowa, March 10, 1910.

WILLIAM F. HANSEN.

lVitnesses: MARY lVALLAcE, WV. A. LOFTUS.

